title: Complete sequence of a reovirus associated with necrotic focus formation in the liver and spleen of Muscovy ducklings.
abstract: The complete sequence of a reovirus, strain 815-12 associated with necrotic focus formation in the liver and spleen of Muscovy ducklings in China, was determined and compared with sequences of other duck-, goose-, and chicken-origin reoviruses. The 815-12 genome comprised 22,969 bp with 10 dsRNA segments ranging from 1125 bp (S4) to 3958 bp (L1), all of which (except S4) were almost identical in length to the cognate segments of other waterfowl and chicken isolates. Detailed analyses revealed that 815-12 and other waterfowl isolates contained the conserved 3'-terminal pentanucleotide sequence (UCAUC-3') of the orthoreoviruses and 5'-terminal hexanucleotide sequence (5'-GCUUUU) of avian orthoreoviruses (ARVs), and conserved functional motifs previously identified in ARV proteins. Several notable differences, including organization of the polycistronic genome segments and genomic coding assignments of the S segments, existed between viruses represented by 815-12 and the waterfowl reoviruses emerging in China in recent years; the latter was somewhat similar to chicken isolates. Pairwise sequence comparisons demonstrated extensive sequence diversity among the various waterfowl isolates and between waterfowl and chicken isolates. Phylogenetic analyses identified two genetic groups for waterfowl reoviruses, and potential genetic reassortment of segment M2 between waterfowl and chicken reoviruses and segments encoding for λA, λB, μA, μNS and σA between waterfowl reoviruses. Taken together, it was suggested that common designation ARV-Wa should be used to represent ARV isolates from different waterfowl species and that the two ARV-Wa genotypes should be considered as two separate groups distinct from chicken isolates within the species Avian orthoreovirus.
authors.affiliation: Key Laboratory of Animal Epidemiology and Zoonosis of Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, No. 2 YuanMingYuan west road, 100193 Beijing, People's Republic of China.
authors.forename: Dan
authors.initials: D
authors.lastname: Wang
authors.forename: Jiajian
authors.initials: J
authors.lastname: Shi
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yuan
authors.forename: Lisha
authors.initials: L
authors.lastname: Zheng
authors.forename: Dabing
authors.initials: D
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001715:Bird Diseases / Q000473:pathology / Q000821:virology*; D002645:Chickens; D002681:China; D017124:Conserved Sequence; D004372:Ducks / Q000821:virology*; D005777:Geese; D016679:Genome, Viral; D008099:Liver / Q000473:pathology / Q000821:virology*; D008969:Molecular Sequence Data; D009336:Necrosis; D030101:Orthoreovirus, Avian / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D010802:Phylogeny; D012088:Reoviridae Infections / Q000473:pathology / Q000662:veterinary* / Q000821:virology; D013154:Spleen / Q000473:pathology / Q000821:virology*
keywords: Avian orthoreovirus; Genome sequence; Muscovy duck reovirus; Orthoreovirus